
perrodeagua, you can do this yourself if you have the time to write a letter. I had to chase this up myself and eventually won back over £6,000 because I was missold unemployment cover--to top it off the bank could not find the original records, so the whole amount was refunded which paid off the balance of the loan and put almost £3,000 back in my account. Try here for help and good luck with getting your payments refunded.
http://www.moneysavingexpert.com/reclaim/ppi-loan-insurance